Lens-mounting.



H. E. KIRSTEIN.

LENS MOUNTING.A

APPucAnoN mso 1AN.29. |911.

1,256,327. 4 Patented Feb.12,1918.

)Figlio Figo@ HENRY E. KIRSTEIN, 0F ROCHESTER, NEW YORK.

LENS-MOUNTING.

Specification of Letters Patent. Patented Feb. 12, 1918.

Application led January 29, 1917. Serial No. 145,106.

To all whom t may concern:

Be it known that I, HENRY E. Krns'rEIN, a citizen of the United States, and resident of Rochester. in the' county of Monroe and vState of New York, have invented certain new and useful Improvements in Lens- Mountings, of which the following is a specyitication.

The present invention relates v to lens mountings and more particularly to the type which is secured to the lens by means of an opening in the form of a slot or recess extending from one edge of the lens, an object of this invention being vto provide, in this type of mounting, a construction which can be used on a flat or toric lens of any thickness. Another object of the invention is to provide a construction in which it is not absolutely essential to use cement in order to hold the lens against looseness on the mounting. Still another object of the invention is to provide a construction which requires a slot with a curved or rounded inner end, thus making the lens less liable to break. A further object of the invention is to `provide a construction in which the permanent connection between the two straps is eliminated, thus permitting a relative movement between the straps under the expansion and contraction of the lens and doing away with another cause for breaking a lens.

To these and other ends, the invention consists of certain parts and combinations of parts,` all of which will be hereinafter d'escribed, the novel features being pointed out in the appended claims.

In the drawings:

Figure 1 is a rear view 'of a mounting constructed in accordance with this invention;

Fig. 2 is a sectional view on the line a-a Fig 1;

Fig. 3 is a view showing the demountable strap removed and the mounting attached to a lens;

Fig. 4 is a perspective view of a mounting with the demountable strap removed;

Fig. 5 is a perspective view of the demountable strap; and

Fig. 6 is a view showing the mounting fitted to a toric or curved lens.

In the illustrated embodiment of the invention, the lens has a slot which extends inwardly from an edge thereof, said slot having its outermost portion formedwilh parallel walls and its innermost portion enlarged anclll formed with substantially cylindrical wa s.

' The mounting is shown as embodied in a bridge for eyeglasses or spectacles. but it is apparent that the invention is not limited to this use. In this embodiment 1 indicates the bridge secured to the supporting part of the mounting which may or may not he the lensbearing element or portion 2 of the mounting, and from the supporting part a strap 3 extends. said strap being integral with the supporting part so asto be rigid therewith.

From the inner face of the strap 3, a web eX- tends, said web having a narrow portion 4 with opposite horizontal faces flat and parallel` and having also an enlarged portion 5, substantially cylindrical in form and situated near the free end of the strap, this enlarged portion having a screw-threaded opening 6 for a lens-screw 7 The web 4-5 is substantially the same size as that of the opening in the lens, and conforms to said opening, so that when the web is introduced into the opening it will tit tightly in the latter, and all looseness will be eliminated.

Coperating with the strap 3 is a removable or demountable strap `8, which has a lens-screw opening 9 and a lateral projection 10 to one side of the lens-screw opening and preferably at one end of the strap, the. width of this projection being less than that of the strap so that the projection may extend into the slot of the lens to cooperate with the upper and lower walls of said slot, in order to prevent the turning of the strap with the lens-screw as the latter is being tightened. To the end that the narrow portion 4 of the web will not interfere with the extension of the 'projection 10 into the 1rens slot. when thin lenses are used, a recess 12 is provided in the narrow portion 4 to provide a pocket for the reception of the projection 10. This recess also tends to weaken the web adjacent the edge of the lens, so that the web and the strap 3 may be bent, as shown in Fig. 6, in order to conform to curved or toric lenses.

In attaching the mounting, the lens is cut to provide a slot conforming substantially in shape and size to the web of the mounting, after which the strap 3 has its web introduced laterally into the slot, and the demountable strap 8 is applied to the opposite face of the lens, being secured in place by the lens-screw 7, the projection 10 extending into the narrowl portion ofthe lens slot to prevent the turning of the strap 8, while the lens screw is being tightened.

An eyeglass mounting constructed in accordance with this invention may be used on a Hat or toric Vlens of any thickness,'as one of its straps is entirely separate from that of the other, and may be held at different distances from the latter. This demountable strap is held against turning with the lens screw by engaging within the slot of the lens to one sidepof the screw. The lens screw has a long or extended bearing in oneof the straps, and Vas a consequence there is less liability for the stripping of the threads. The mounting requires an opening in the lens'which hasrno sharp corners at the inner Lend of said opening tending to cause the cracking of the lens, and the walls of this opening are engaged in such a manner by the web that there is no chance for loosenessl nor opportunity for the withdrawal of the mounting in the direction of the length of the opening. As the straps are'not rigidly connected together, there is no danger of breaking lenses due to the straining of the mounting under the action of the lens screw. The end of the lens screw may be spun to lock the screw in place without any contact with the lens. The construction as a whole enables the optician'to mount the lenses with the smallest chance for breaking the same. Y

What I claim as my invention and desire to secure by Letters Patent is Vl. In 'combination' with a lens having a slot extending to an edge thereof, said slot l having parallel walls in proximityto said vedge and a substantially circular enlarged inner end, a lens mounting comprising two straps, one of which has a substantially cylindrical portion fitting in said substantially circular enlarged inner end and being of a size to prevent its being passed through the other portion of the slot, and also has a portiony fitting between the parallel walls, and the other ofsaid straps being demountable and having a portion fitting-in said last mentioned portion of the slot, and a screw passing throughtheportion of the strap in the substantiallyy circular enlarged portion of the slot and holding said straps together.

2. A lens mounting comprising a lensbearing portion for an edge of a lens, a strap rigid with said lens-bearing portion having a screw opening, a demountable strap having a screw opening, and a lateral projection arranged to engage with the lensbearing face of the lens-bearing portion.

3. A lens mounting comprising a supporting portion, a strap rigid with said supporting portion, a lens bearing portion on said supporting portion for engaging an edge of the lens, and a web Vprojecting from said strap with its portion near the freev end of the strap enlarged and providedwith a screw opening andits smaller portion provided with a recess between the enlarged portion and the. lens bearing portion, a demountable strap having a screw opening and a projection on its inner side to one side of said opening, fitting in said recess, and a screw for holdingthe two straps in engagement with opposite faces of the lens. v s

4. In combination with a lens havingv a slot extending'froin an edge and larger at its inner end, a lens mount-ingv comprising a supporting portion, two straps, one of which is rigid Awith the supporting portion and is provided with a web yenlarged near the free Vend of the strap, the narrow portion of the web having a recess permitting the bending of the strap, and a screw for drawing the two straps in Contact with opposite faces of the lens. Y

5. In combination with a lens having a slot extending to an edge thereof, said slot having parallel walls 'in proximity to said edge and a substantially circular enlarged inner end, a lens mounting comprising two straps, one of which is demountable and the other of which has a portion fitting between the parallel walls of the slot, and a substantially cylindrical portion integral with the strap fitting in said substantially circular enlarged inner end of the slot and being of a size to prevent its being passed through the other `portion of the slot and a screw for securing said straps together. Y HENRY E. KIRSTEIN.

copies 0f this Patient may be obtained for ve cents each, by addressing the Commissioner of Patents,

' Y Washington, D. C. a

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